Fused attachment plug fitting



June 21,' 1932. L. BARNETT 1,863,824

FUSED ATTACHMENT PLUG FITTING Filed Oct. 2, 1929 IN VEN TOR.

m w w Patented June 21, 1932 PATENT OFFICE LOU I8 um, 330011, new You 'I'UBRD arracnm PLUG m0 Original application fled December 28, 1817, Serial Io. 841,808. Divided and this application filed October I, ma. Serial No. 390,645.

This invention relates to attachment fittings for electric circuits of the plug-in type for use in connection with portable appliances, lighting systems, storage battery 6 charging circuits, radio sets and other like electric apparatus.

One object of the invention is to provide an improved fitting of the character described which shall include in novel combination, current carrying parts having means for readily insertin in series circuit therewith standard types 0 resistances or fuses. Where fuses are connected in circuit they are incorporated so as to be safely inspected or replaced by even those unskilled in the electric art and without requiring disassembling the fitting.

A further object of the invention is to provide improved attachment fittings of the character described comprising few and simple parts which shall form a neat, rugged,

compact structure, which shall be cheap to manufacture and practical and efficient to a high degree in use.

Certain features herein shown and described are shown and described in my Letters Patent No. 1,730,873, issued Oct. 8, 1929, of

which this application is a divisional part thereof.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements and arrangement of parts which will be exemplified in the constructions hereinafter described and of which the scope of application will be indicated in the following claims.

In the accompanying drawing, in which is shown various possible illustrative embodiments of this invention,

Fig. 1 is a bottom plan view of a fused capplug embodying the invention.

Fig. 2 is a cross-sectional view taken on lines 22 in Fig. 1.

Fig. 3 is a bottom plan view of a modification of the invention in the form of a fused receptacle-plug fitting.

50 Fig. 4 is a cross-sectional view taken on lines 4-4 in Fig. 3, and

Fig. 5 is a top plan view of the improved fittin shown in Fig. 3.

Re erring in detail to the drawing, 10 denotes an attachment fitting embodying the invention adapted to connect an electrical appllance to a suitable power receptacle outlet, or to be plugged into a circuit between a separable attachment plug and ca of any well understood standard construction in the well known manner.

In the form of the invention shown in Figs. 1 and 2, the fitting 10, is seen to comprise a one-piece cap body 13 formed of molded insulating material having a recess 13a extendin in from the under or bottom side 13?) thereo Secured in said recess by anchor eyelet rivets 14 are the current carrying-parts 15 which are seen to include terminal blades 15a projecting from said bottom side 1312, and spring clips 15?) secured to the attached end of the blades. Spaced from said blades 15a and clips 151) are terminal members 150 having screws 15d which serve as binding posts to secure thereto portable conductor wires of an extending portable circuit to an electric appliance (not shown) in the well understood manner. Said members 150 carry spring clips 15c which align with the spring clips 15b forming pairs for engaging with terminal ends 16a of enclosing fuses 16. Said fuses 16. are preferably of the midget type such as used in automobile and radio practice, the tubes enclosing the fuse element thereof being usually formed of transparent material, such as glass," so that the fuse elements are visible for inspection.

The body 13 is provided with a through opening extending in from the side of the body opposite the bottom side 1236 and communicating with the recess 13a to permit passage of the portable conductor wires (not shown) for connecting with the terminal post screws in the well understood manner. The improved construction of the fitting 10 is not only simple and compact but is also safe and convenient to handle.

In using the invention for fitting 10 may be connected to the end of the portable conwell understood matter. To guard the circuit to which the fitting is applied from being overloaded and to protect the appliance connected in said circuit, that is, for limiting the maximum current flow passing from the power source through the fitt1ng10 to the portable conductor wires and hence to the electrical a liance, the midget fuses 16, are inserts tween the pairs of spring clips 15b and 154;, thus comp eting the normall open series circuit between each of the terminal members 150 and blades 150. These fuses 16 are conveniently and readily inspected and can be replaced when necessary, with safety to the user since it is obvious that the fitting 10 must be disconnected from the power source in order to inspect or replace the fuses 16.

In Figs. 3, 4, and 5, another modification of the invention is shown, in the form of a fused receptacle-plug fitting 110. The fitting 110 as seen from the drawing, is similar in every re ect to the fitting 10 described above an shown in Figs. 1 and 2 with the exceptions that are hereinafter noted.

The one-piece body 113 of the fitting 110 is provided with a flat outer side 113d opposite to the bottom side 113b, said side 113d having throughpassages 113g therein communicating with the recess 113a, the latter extending in from the bottom side 113b. Into said passages 113 extend the free sprin ends of contact members 114) which are a apted to detachably connect with blade terminals of the cap plug of a portable circuit (not shown) in the well understood manner. The lower ends of the members 114; attached. to the body 113 have spring clips 1159 which ali with the sprin clips 115?) secured to t e blades 115a to orm airs for removably engaging with the termmal end 16a of midget fuses 16.

To use the fitting 110, the terminal blades 115a are connected to a suitable power supply source receptacle outlet, in the well understood manner, and the blade terminals of a portable circuit are plugged in to the receptacle passages 113g. To inspect the fuses 16 the fitting 116 must be removed from circuit.

In both the forms of the invention shown in Figs. 1 to 5 inclusive, the fuse elements limit the maximum current flow passing through the fittings and 110 from the power source to the connecting portable circuit.

If desired, one or both demountable fuses 16 may be replaced by other forms of current limiting means, such as coil resistance (not shown) in the well understood manner.

It will thus be seen that there is provided devices in which the several ob'ects of this invention are achieved and whlch are well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawing is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A deviceadapted' to be interposed between the two conventional parts of a separable attachment plug comprlsin a oneiece insulating body havmghparallel y space flat sides, one of said sides aving socket recesses extending perpendicularly mto the body, spring terminals within said recesses adapted to receive the blades of a cap, contact blades projecting from the other side of said body perpendicularly therefrom adapted to engage other spring terminals of a separable lug, the last mentioned side having a recess t erein, spring clamping means connecting with said terminals and blades in said last mentioned recess, and current limiting means demountably secured in series circuit by said clamping means.

2. A plug cap of the character described comprism a one-piece insulatin body having a flat ttom side formed with a recess extending into the body, contact blades projecting from said side perpendicularly therefrom adapted to engage the terminals of a power outlet, binding post members adapted to attach the conductor wires of a portable circuit spaced from said blades in said recess, spring clamping means connecting with said blades and members, and current limiting members secured by said means in series circuit between said blades and members, said body having a passage communicating with the recess ada ed to permit said conductor wires to pass t rough. I

3. In a plug cap construction of the character described comprising a one-piece insulating body having a flat bottom side formed with a recess extending into the body, spaced contact blades projecting perpendicu: larly from said side adapted to engage terminals of a plug type power outlet, a s rin clamping chp connecting with each ofsai blades, a spring clamping clip secured in spaced parallel alignment with each of said first mentioned -cl1 and current limiting means bridging said itligned clips.

In testimony whereof I aflix my si ature.

LOUIS BAR 'IT. 

